Well, to be fair there have never been much Waifu material in DGM to be honest.
The females are either too young or not relevant enough to be considered for Wives, well at least in my understanding of the word "waifu". Maybe Miranda though.
Also regarding the fandom activity, I don't know if I'm the only one but I check the forum from time to time to see if something has been posted and I'll be glad to be active if I feel likely to be answered to and discussed with. But..; well if everyone thinks like me this is kind of a vicious circle I know x)